If you could take a minute to fill in some of your profile information that would be helpful to all members of the forum
Knowing someone's location in the world can be extremely helpful, even if you just put a country.

Also remember to post any problems or questions that you have in the appropriate forums

With regards to your problem, it does sound like there may be a problem with your cd drive, also you will need to run a windows repair installation to fix the NDLTR file